Monster Hunter Wilds simplifies many series mechanics, making monster tracking largely unnecessary. However, the Black Flame presents a slight exception. Here's how to locate it.
Tracking the Black Flame in Monster Hunter Wilds
Around the midpoint of Monster Hunter Wilds' main story, Chapter 3 introduces the Black Flame. After a brief appearance, it retreats to the Oilwell Basin. Your task: find and defeat it.
Leave Base Camp and head towards Zone 9 of the Oilwell Basin (see map below).

Along the way, you'll discover tar tracks. Examining them reveals the Black Flame's trail, automatically guiding your scoutflies. Follow the green path illuminated by the scoutflies in Zone 9, leading to a large flaming crater, to find the Black Flame.
The Black Flame (also known as Nu Udra) is a tentacled monster wielding fire-based attacks. Strategically targeting and severing its tentacles first simplifies the fight, granting easier access to its weak points and yielding more materials upon its defeat.
To combat the region's intense heat, carry several Cool Drinks to prevent continuous health depletion.
That's how to find the Black Flame in Monster Hunter Wilds. Check out The Escapist for more game tips, including changing your Palico's language and monster capture techniques.